Yes, most of that is correct. You are completely exempt approved ground training if you have an ATPL with 1500hrs+ on aircraft certified for two pilot operation. If you hold an ATPL but don't have the 1500 hours two pilot time then you have to do an appproved course but the time spent on the course may be reduced at 'the discretion of the Head of Training of an approved FTO'. Frozen ATPLs/CPLs get no credits.
A full approved modular course must consist of at least 650 hours of instruction, 10% at least must be done in the classroom.